ArticlePDF Available

Abstract and Figures

The purpose of this article was to review dimensional studies of schizotypy in the last decade; particularly, its nature and structure, for a better understanding and definition of this construct. Data from those studies indicate that schizotypy is a multidimensional construct consisting in three or four dimensions. A Positive factor (Unusual experiences) and a Negative factor (Anhedonia) were widely confirmed, but a third or even a fourth dimension (Disorganization, Impulsive non-comformity, Paranoia or Social Anxiety) were also found. Dimensions of schizotypy vary according to gender and age, showing men higher scores in the Negative dimension than women, while women score higher in the Positive dimension and in the Social Anxiety factor than men; however, a precise comparison is hindered by the instruments, the samples, and the statistical model used. The Schizotypal Personality Questionnaire is most studied instrument, as it shows good consistency in a tri-factorial solution. Factorial analyses of schizotypy were done in very different cultures. Future research should bear several aspects in mind: methodological shortcomings, a combined use of different measures of schizotypy, the study of this construct in different cultures, and the relationship of schizotypy with other variables.
Content may be subject to copyright.
ne of the most important challenges for
psychopathology today is the study of the features
and characteristics that make people vulnerable to
the appearance of psychological disorders. Thus, current
research efforts are aimed at detection of and early
intervention in people with a propensity for developing
psychological problems. In this regard, studies on early
intervention in schizophrenia are quite well-developed by
comparison with those on other disorders. The literature
indicates that early intervention in schizophrenia is a
good predictor of obtaining better results in treatment
(McGlashan & Johannessen, 1996), a finding that has led
to the development of a wide variety of programmes
throughout the world (Vallina, Lemos Giráldez, &
Fernández, 2006).
Schizotypy has been since its origins closely related to
psychosis. The schizotypy concept, also referred to by the
term psychosis proneness (Chapman, Edell, & Chapman,
1980), can be seen as a normal personality dimension or
as an indicator of predisposition to psychoses (Claridge,
1997; Cyhlarova & Claridge, 2005). Diverse studies
indicate that psychotic experiences are present in the
normal population, suggesting the existence of a
Eduardo Fonseca-Pedrero, José Miz, Seran Lemos-Giráldez, Eduardo García-Cueto,
Ángela Campillo-Álvarez and Úrsula Villazón García
University of Oviedo
The purpose of this article was to review dimensional studies of schizotypy in the last decade, particularly on its nature and
structure, with a view to a better understanding and definition of this construct. Data from these studies indicate that schizotypy
is a multidimensional construct consisting of three or four dimensions. A Positive factor (Unusual experiences) and a Negative
factor (Anhedonia) were widely confirmed, but a third or even a fourth dimension (Disorganization, Impulsive Nonconformity,
Paranoia or Social Anxiety) were also found. Dimensions of schizotypy vary according to gender and age, men presenting
higher scores in the Negative dimension than women, while women score higher than men in the Positive dimension and in the
Social Anxiety factor; however, a precise comparison is hindered by the instruments, the samples, and the statistical model used.
The Schizotypal Personality Questionnaire is the most widely studied instrument, as it shows good consistency in a tri-factorial
solution. Factorial analyses of schizotypy were carried out in widely differing cultures. Future research should bear several
aspects in mind, notably: methodological shortcomings, the combined use of different measures of schizotypy, the study of this
construct in different cultures, and the relationship of schizotypy to other variables.
Key words: Review, Schizotypy, Psychosis proneness, schizotypal traits, Factor analysis
El objetivo del presente trabajo consistió en llevar a cabo una revisión de las dimensiones de la esquizotipia en la última
década. La finalidad fue estudiar la naturaleza y estructura de la esquizotipia de cara a una mejor comprensión y delimitación
del constructo. Los datos indican que la esquizotipia es un constructo multidimensional que se puede concretar en tres o cuatro
dimensiones. El factor Positivo (Experiencias Inusuales) y el factor Negativo (anhedonia) han sido ampliamente replicados. El
tercer y/o cuarto se concreta en una dimensión de Desorganización, de No Conformidad Impulsiva, de Paranoia o Ansiedad
Social. Las dimensiones de la esquizotipia varían en función del sexo y la edad. Los varones tienden a puntuar más elevado
que las mujeres en la dimensión negativa mientras que las mujeres lo hacen en la dimensión positiva y en el factor Ansiedad
Social. La comparación estricta entre los estudios factoriales se encuentra dificultada por el tipo de instrumento, la muestra
empleada y el modelo estadístico utilizado. El Schizotypal Personality Questionnaire es el cuestionario más investigado,
mostrando gran consistencia en su solución trifactorial. Los estudios factoriales de la esquizotipia se han realizado en una
amplia variedad de culturas. Las futuras investigaciones deberán tener presente las limitaciones metodológicas, la aplicación
de diferentes medidas de esquizotipia de forma conjunta, el estudio del constructo a través de las diferentes culturas y la
relación de la esquizotipia con otras variables.
Palabras clave: Revisión, Esquizotipia, Propensión a la psicosis, Rasgos de la esquizotipia, Análisis factorial
Correspondence: Eduardo Fonseca-Pedrero. Facultad de Psicolo-
gía. Plaza Feijoo, s/n. Oviedo 33003. España.
Regular articles
Papeles del Psicólogo, 2007. Vol. 28(2), pp. 117-126
dimensional continuum (Johns & van Os, 2001) between
the normal population and such experiences (Verdoux &
Van Os, 2002). Schizotypy is within the framework of this
model (Claridge, 1997), also extending from non-
pathological personality (health) to psychosis (illness).
Variations along this continuum describe different
degrees of predisposition to psychotic disorders. Such
vulnerability or predisposition to schizophrenia is
expressed, then, along a psychopathological continuum.
The relevance of research on schizotypal features rests
on three basic points. First of all, it helps to improve
understanding of the mechanisms underlying
schizophrenia, exploring the links between the two
entities. Secondly, it permits the study of subjects free of
psychotic illness, without the side effects of medication
and iatrogeny (Heron, Jones, Williams, Owen, Craddock,
& Jones, 2003; Martinena Palacio et al., 2006). Thirdly,
it offers the possibility of detecting, by means of self-
reports and interviews, participants with a high
probability of developing disorders on the schizophrenic
spectrum, in the so-called psychometric high-risk
paradigm (Lenzenweger, 1994).
Studies on assessment of schizotypal personality fall
basically within the framework of psychometric high-risk
research. Their purpose is none other than to detect, by
means of psychometric tests, those subjects likely to
develop disorders on the schizophrenic spectrum, such as
schizophrenia, schizoaffective disorders or schizoid,
paranoid or schizotypal personality. Thus, high scores in
the schizotypy measure appear to indicate a certain
proneness to the development of disorders on the
schizophrenic spectrum (Chapman, Chapman, Raulin, &
Eckblad, 1994; Gooding, Kathleen, & Matts, 2005;
Kwapil, Miller, Zinser, Chapman, & Chapman, 1997),
and also constitute the best predictor with respect to
subsequent development of this type of disorder among a
broad range of psychopathological variables (Gooding et
al., 2005). With the aim of measuring the schizotypy
concept, a wide variety of self-report instruments have
been created, the most notable of which are the
Schizotypal Personality Questionnaire
, in both its long
and its short versions (Raine, 1991; Raine & Benishay,
1995), and the scales designed by the Wisconsin-
Madison University group:
Perceptual Aberration Scale
(Chapman, Chapman, & Raulin, 1978),
Magical Ideation
(Eckblad & Chapman, 1983),
Physical and Social
Anhedonia Scales
(Chapman, Chapman, & Raulin,
1976) and
Revised Social Anhedonia Scale
Chapman, Chapman, & Mishlove, 1982). The majority of
these scales have been adapted and translated for
Spanish samples by different research groups (Mata,
Mataix-Cols, & Peralta, 2005; Muntaner, García-Sevilla,
Fernández, & Torrubia, 1988).
As in the case of schizophrenia, a multidimensional
structure has been proposed for schizotypy. There has
been extensive debate in recent years on the structure of
schizotypy, with attempts to determine the nature and
number of psychopathological dimensions. The objective
of the present work is to study the nature and structure of
schizotypy through the different factorial studies carried
out on assessment self-reports. The purpose is to provide
an up-to-date picture of schizotypy and to clarify its
structure, in terms of number and content of factors, with
a view to understanding, defining and working with this
Research on the dimensionality of schizotypy is closely
linked to the technique of factor analysis and the notion of
factor itself. Therefore, before embarking on the study of
the schizotypy dimensions it is necessary to clarify the
objective of factor analysis and what we understand by
factor. According to the main proponent of this technique
in Spain, Mariano Yela: “
The aim of factor analysis is to
reveal the dimensions of common variability in a given
field of phenomena. Each dimension of common
variability is called a factor
” (Yela, 1997, p. 25).
Concentrating on the factor analyses of schizophrenia
and schizotypy, the accumulated empirical evidence
indicates that schizophrenia is a multifactorial construct
(John, Khanna, Thennarasu, & Reddy, 2003; Lemos
Giráldez et al., 2006; Lindenmayer et al., 2004). The
factors found in schizotypy emerge as phenotypically
parallel to those found in schizophrenia. This similarity
between the two entities may indicate a common
aetiological mechanism (Meehl, 1962), though not
necessarily so (Venables & Rector, 2000).
Table 1 shows the factor analyses carried out in the last
decade and the number of factors, type of sample,
instrument used and type of statistical analysis. It is
important to mention that the factorial studies carried out
differ clearly in sample type (clinical, non-clinical, culture
of origin and age), number of participants, quantity and
type of measurement instruments employed and
methodological analyses, which makes their comparison
extremely difficult (Álvarez López & Andrés Pueyo, 2006;
Regular articles
Reference of factors Scales Sample Type and nationality Type of analysis
N; Mean (SD)
Chen, Hsiao, & Lin, 1997 3 Cognitive-Perceptual SPQ PAS (1) 345; 42.9 (12.8) (1) Adults CFA
Interpersonal (2) 115; 14.0 (0.8) (2) Adolescents from Taiwan
Wolfradt & Straube, 1998 3 Magical Ideation/Perceptual STA 1362; 15.6 (1.12) German adolescent students EFA
Ideas of reference/social anxiety
DiDuca et al., 1999 5 Cognitive JSS (MSTQ) 492; 15.5 (1.75) English adolescent students EFA-T
Social Anhedonia
Physical Anhedonia
Martínez-Suárez et al., 1999 3 Positive MSTQ (JSS) 721; 15.8 Spanish high-school students EFA-T
Impulsive Nonconformity
Reynolds et al., 2000 3 Cognitive-Perceptual SPQ 1201;23.3 (1.17) Mauritanians CFA
Interpersonal Deficits
Venables et al., 2000 3 Positive (disorganized) SS 330; 20.41 (5.89) English student CFA
Social Deficit
Axelrod et al., 2001 3 Interpersonal SPQ-B 237; 15.8 (1.4) Adolescent psychiatric patients EFA
Rawlings et al., 2001 5 Magical Thinking STA 1073; 39.9 (16.8) English adults EFA-T
Paranoid Suspicion and Isolation
Unusual Perceptual Experiences
Social Anxiety
Suhr et al., 2001 3 Positive SPQ MAS MIS 1336 US university students EFA
Suhr et al., 2001 (2) 3 Positive SPQ MAS MIS 348 US university students with EFA
Negative high schizotypy
Paranoid Thinking
Rossi & Daneluzzo, 2002 3 Cognitive-Perceptual SPQ 347 Schizophrenics, bipolars, CFA
Interpersonal Deficits 5 subsamples OCD, depressives and control
Disorganization group, Italians M= between 25.4 and 43.4
Fossati et al., 2003 3 Cognitive-Perceptual SPQ (1) 803; 21.93 (1.57) (1) University students EFA
Interpersonal Deficits (2) 929; 16.43 (1.45) (2) Italian adolescent students
Stefanis et al., 2004 4 Cognitive-Perceptual SPQ 1335; 20.3 (1.8) Greek reserve soldiers CFA
Calkins et al., 2004 3 Cognitive-Perceptual SPQ (1) 135; 46.5 (15.3) (1) Relatives of psychotics EFA
Interpersonal Deficits (2) 112; 34.6 (13.3) (2) US adults
Linscott & Knight, 2004 4 Aberrant Beliefs TPSQ 216; 20.2 (3.8) New Zealand university EFA-T
Social Fear and Paranoia students
Anhedonia (physical and social)
Aberrant Information Processing
Regular articles
Stefanis, Smyrnis, Avramopoulos, Evdokimidis,
Ntzoufras, & Stefanis, 2004).
As occurs in the case of schizophrenia, there seems to be
no agreement on the number of dimensions. Factorial
studies do not yet present a unitary picture with respect to
the structure underlying schizotypy. The numbers
proposed are two (Aycicegi, Dinn, & Harris, 2005), three
(Compton, Chien, & Bollini, 2007; van Kampen, 2006;
Reference of factors Scales Sample Type and nationality Type of analysis
N; Mean (SD)
Cyhlarova et al., 2005 3 Unusual Perceptual Experiences STA (children) 317; 13.3 (1.2) English adolescent students EFA
Paranoid Ideation/Social Anxiety
Magical Thinking
Lewandowski et al., 2006 3 Positive Schizotypy PAS MIS 1258;19.4 (3.7) US university students CFA
Negative Schizotypy PhARSoA
Negative affect BDI BAI
Aycicegi et al., 2005 2 Positive SPQ-B (1) 190; 20.3 (1.8) (1) Turkish university students EFA
Negative (2) 260; 18.7 (1.2) (2) US university students
Mata et al., 2005 3 Interpersonal SPQ-B 477; 21.1/20.2 (4.6/4.3) Spanish university students EFA-T
Badcock et al., 2006 3 Cognitive-Perceptual SPQ 352; 39.9 (10.9) Australian adults CFA
Interpersonal Deficits
van Kampen, 2006 3 Positive Schizotypy SSQ 771; 36.1 (10.3) Dutch adultos EFA
Negative Schizotypy
Asocial Schizotypy
Wuthrich et al., 2006 (1) 3 Cognitive-Perceptual SPQ 558; 22.7 (6.4) Australian university students CFA
Wuthrich et al., 2006 (2) 3 Cognitive-Perceptual MIS PAS RoSA SPQ 277; 21.7(5.3) Australian university students CFA
Mass et al., 2007 6 Negative/Interpersonal ESI,PAS, 159; 26.3 (5) German secondary and EFA-O
Positive Cognitive-Perceptual SPQ,STA university students
Disorganized Schizotypy and SPI
Magical Thinking
Social Anxiety
Psychotic Experiences
Fonseca-Pedrero et al., 2007 4 Aberrant Information Processing TPSQ 321; 13.8 (1.3) Spanish adolescents EFA-T
Social Paranoia
Aberrant Beliefs
Compton et al., 2007 3 Cognitive-perceptual SPQ-B 118; 46.2 (12.2) US normal first-order relatives CFA
Note: JSS:
Junior Schizotypy Scales
Combined Schizotypal Traits Questionnaire
; MIS:
Magical Ideation Scale
; PAS:
Perceptual Aberration Scale
Multidimensional Schizotypal Traits Questionnaire
; PAS:
Perceptual Aberration Scale
; PhA:
Physical Anhedonia
; RSoA:
Revised Social Anhedonia
; SPQ:
Personality Questionnaire
; SPQ-B:
Schizotypal Personality Questionnaire Brief
; SS:
Schizotypal Scale
; STA:
Schizotypal Personality Scale
; STB:
Borderline Personality
; SSQ:
Schizotypal Syndrome Questionnaire
; BDI:
Beck Depression Inventory
; BAI:
Beck Anxiety Inventory
Oxford-Liverpool Inventory of Feelings
Thinking and Perceptual Style Questionnaire
; ESI:
Eppenford Schizophrenia Inventory
; SPI:
Schizotypal Personality Inventory.
CFA: Confirmatory Factor Analysis; EFA-T: Orthogonal Exploratory Factor Analysis; EFA- O: Oblique Exploratory Factor Analysis.
Regular articles
Wuthrich & Bates, 2006) four (Mason & Claridge, 2006;
Rawlings, Claridge, & Freeman, 2001; Stefanis et al.,
2004), five (DiDuca & Joseph, 1999), or even six (Mass
et al., 2007) dimensions. These factors vary according to
participants’ sex and age (Mata et al., 2005).
The majority of studies present a three- or four-
dimensional solution in which the positive (Cognitive-
Perceptual or Unusual Perceptual Experiences) and
negative (Anhedonia, Introverted Anhedonia or
Interpersonal Deficits) dimensions of schizotypy have
been widely replicated. The current debate focuses on the
inconsistent nature of the third dimension (Suhr &
Spitznagel, 2001). In the three-dimensional models some
authors propose a (Cognitive) Disorganization dimension
(Fossati, Raine, Carretta, Leonardi, & Maffei, 2003),
while others prefer an Impulsive/Asocial Nonconformity
dimension (DiDuca & Joseph, 1999; Martínez-Suárez,
Ferrando, Lemos, Inda Caro, Paino-Piñeiro, & López-
Rodrigo, 1999; van Kampen, 2006). In the case of the
four-dimensional models the factors proposed are Positive
(Unusual Experiences), Negative (Introverted Anhedonia),
Cognitive Disorganization, and Impulsive (Mason &
Claridge, 2006) or Paranoid (Stefanis et al., 2004; Suhr
& Spitznagel, 2001) Nonconformity. The Paranoid factor
is usually combined with a Social Anxiety factor
(Cyhlarova & Claridge, 2005; Wolfradt & Straube,
1998). The Positive dimension breaks up, resulting in the
emergence of a factor of Magical Thinking or Aberrant
Thoughts (Cyhlarova & Claridge, 2005; Fonseca-
Pedrero, Campillo-Álvarez, Muñiz, Lemos Giráldez, &
García-Cueto, 2007; Linscott & Knight, 2004; Rawlings et
al., 2001). The variety of the factors found depends to a
large extent on the instrument employed for measuring
the construct. The body of research currently available
includes studies that have used in a combined way
various types of self-reports for measuring schizotypal
features; the three-dimensional solution (positive, negative
and disorganization), with or without modifications, has
emerged as the most appropriate and stable (Chen,
Hsiao, & Lin, 1997; Suhr & Spitznagel, 2001; Wuthrich
& Bates, 2006).
The Positive dimension of schizotypy, also known as
Unusual/Anomalous Perceptual Experiences or
Cognitive-Perceptual, refers to an excessive or distorted
functioning of a normal process. Its facets include
hallucinations, paranoid ideation, ideas of reference and
thinking disorders. On the other hand, the Negative
factor, also known as Anhedonia, Introverted Anhedonia
or Interpersonal Deficits, refers to a reduction or deficit in
the person’s normal behaviour. It embraces facets
involving difficulties for experiencing pleasure at a
physical and social level (anhedonia), flattened affect,
absence of close confidants and difficulties in
interpersonal relations. The Positive dimension is
associated with temporolimbic dysfunctions,
impulsiveness, antisocial behaviour (Dinn, Harris,
Aycicegi, Greene, & Andover, 2002) and symptoms of
anxiety and depression, indicating higher risk of
presenting affective problems and non-affective psychotic
disorders (Lewandowski, Barrantes-Vidal, Nelson-Gray,
Clancy, Kepley, & Kwapil, 2006). The Negative
dimension is associated with a deficit in frontal functions,
social anxiety and obsessive-compulsive phenomena
(Dinn et al., 2002). It appears to indicate a more specific
risk of disorders in the schizophrenic spectrum
(Lewandowski et al., 2006). Both the Positive and
Negative dimensions of schizotypy have been associated
with genetic vulnerability to schizophrenia (Calkins,
Curtis, Grove, & Iacono, 2004; Vollema, Sitskoorn,
Appels, & Kahn, 2002). The Disorganization factor
describes thinking problems, strange or unusual language
and strange behaviour. The Impulsive Nonconformity
factor refers to aspects related to rebelliousness,
impulsiveness and extravagance.
As Table 1 shows, with regard to type of sample in
research on schizotypy, there are studies in children and
adolescents (Cyhlarova & Claridge, 2005) and in adults
(Badcock & Dragovic, 2006). Participants tend to be
secondary-school pupils (Fonseca-Pedrero et al., 2007)
or university students (Lewandowski et al., 2006), though
there are also representative studies with reserve soldiers
(Stefanis et al., 2004), in first-order relatives of
schizophrenia patients (Calkins et al., 2004; Compton et
al., 2007) and in other types of psychiatric population
(Axelrod, Grilo, Sanislow, & McGlashan, 2001; Vollema
& Hoijtink, 2000). Sample sizes vary considerably, from
those with rather small numbers (Mass et al., 2007) to
larger-scale ones (Suhr & Spitznagel, 2001).
The most widely-used psychometric measure in factorial
studies is the
Schizotypal Personality Questionnaire
(SPQ), in its two versions (Raine, 1991; Raine &
Benishay, 1995). The SPQ has been used in different
populations with a range of different characteristics, as
well as in conjunction with other schizotypy assessment
measures and with other statistical models. As Vollema
and Hoijtink (2000) point out, the SPQ data appear to
Regular articles
indicate a certain convergence towards a tripartite
structure of schizotypy, invariant across sex, age
(Badcock & Dragovic, 2006; Fossati et al., 2003), culture
(nationality), religious affiliation, family conditions (e.g.,
adversity or its absence), psychopathology (Reynolds,
Raine, Mellingen, Venables, & Mednick, 2000), sample
composition and statistical models (Vollema & Hoijtink,
The last ten years have seen a tendency among
researchers to carry out both exploratory and
confirmatory factor analyses, which show a clear
equivalence. Of all the factorial studies reviewed, there is
only one approach from Rasch’s multidimensional model
(Vollema & Hoijtink, 2000), even though there are others
with different purposes (Graves & Weinstein, 2004).
Nevertheless, studies have also been carried out using
cluster analysis (Barrantes-Vidal, Fañanás, Rosa,
Caparrós, Riba, & Obiols, 2003).
As regards the nationality of participants in factorial
studies on schizotypy, the review carried out indicates the
presence of a wide variety of cultures. There are studies
with Spanish (Fonseca-Pedrero et al., 2007), Australian
(Wuthrich & Bates, 2006), American (Lewandowski et al.,
2006), Italian (Fossati et al., 2003), German (Wolfradt &
Straube, 1998), Oriental (Chen et al., 1997), Greek
(Stefanis et al., 2004), New Zealander (Linscott & Knight,
2004) and British (Rawlings et al., 2001) participants.
The structure of schizotypal features across different
nationalities indicates substantial cultural invariance,
which lends greater support to the cross-cultural validity
of the construct.
Finally, as mentioned above, the schizotypal dimensions
vary according to participants’ sex and age. As far as sex
is concerned, women score higher than men in the so-
called positive symptoms (Cyhlarova & Claridge, 2005;
Mason & Claridge, 2006; Mass et al., 2007; Mata et al.,
2005; Rawlings et al., 2001; Venables & Bailes, 1994),
as well as presenting higher total scores in some self-
reports (Claridge et al., 1996; Rawlings et al., 2001) and
Social Anxiety (Badcock & Dragovic, 2006; Fossati et al.,
2003; Mass et al., 2007). In contrast, men tend to score
higher than women in the so-called Negative dimension
of schizotypy (Claridge et al., 1996; Linscott & Knight,
2004; Mason & Claridge, 2006; Venables & Bailes,
1994; Wuthrich & Bates, 2006) and on the SPQ
subscales of flattened affect, strange behaviour and lack
of close friends (Badcock & Dragovic, 2006; Wuthrich &
Bates, 2006). With regard to age, the factorial studies
carried out in adults indicate that the Negative factor
(e.g., Introverted Anhedonia) is positively correlated with
age, whilst the Positive factor is negatively correlated with
it (Mason & Claridge, 2006; Mata et al., 2005; Rawlings
et al., 2001). In comparisons of participants according to
age, young people tend to score higher on the schizotypy
scales and/or dimensions than those who are older (Chen
et al., 1997; Fossati et al., 2003; Venables & Bailes,
1994). Factorial studies in adolescents indicate a certain
tendency towards the paranoid ideation or thinking
dimension (Cyhlarova & Claridge, 2005; Rawlings &
MacFarlane, 1994; Suhr & Spitznagel, 2001; Venables
& Bailes, 1994), though it should be borne in mind that
schizotypal dimensions in this age group may form part
of the processes of development and maturation (DiDuca
& Joseph, 1999).
The study of personality dimensions is a classic field but a
highly pertinent one within psychology. In research on
schizotypy there have so far been very few theoretical
reviews attempting to provide a comprehensive account
of the large number of studies on the subject. The aim of
the present work is to explore the principal factor analyses
of schizotypy. The purpose is none other than to analyze
the structure and nature of schizotypy, in terms of the
number and content of factors, with a view to better
definition and understanding of the construct and
consideration of its parallels with schizophrenic
psychosis. The importance of schizotypy resides in the
detection of people vulnerable to the development of
disorders on the schizophrenic spectrum, in the study of
symptoms similar to schizophrenia without side effects of
the medication, and in an improved understanding of the
mechanisms underlying schizophrenia and the links
between the two entities.
The review of factor analyses reveals that schizotypy is a
multidimensional construct based on three or four factors
phenotypically similar to those found in schizophrenia.
The Positive (Unusual Experiences) and the Negative
(Anhedonia) dimensions appear in a consistent fashion
throughout the literature. The third (or even fourth)
dimension emerges as a factor of Disorganization, of
Impulsive (Asocial) or Paranoid Nonconformity
(sometimes linked to a Social Anxiety factor). In some
studies the Positive factor of schizotypy breaks off,
constituting a single factor called Magical Thinking or
Aberrant Beliefs. The relationships between the factors
Regular articles
found are multiple, varied and confused, similar terms
sometimes being used to define different dimensions. The
variety of studies carried out over the last ten years
reveals the richness of this field, in which there would
seem to emerge a certain coherence in the nature and
structure of schizotypy, even though it is still not a fully
unitary concept. The main limitation found on making
comparisons between factorial studies concerns the type
and quantity of instruments, the nature of the sample, and
the statistical model employed.
Schizotypal Personality Questionnaire
(SPQ), in
both its long and its short versions, is the most widely used
instrument for the assessment of schizotypy in the factorial
studies reviewed. The samples used are basically made
up of university students, among whom the schizotypy
dimensions behave differently according to sex and age.
As is also the case for schizophrenia, women tend to
score higher than men in the Positive dimension, whilst
men score higher in the Negative dimension.
The possible limitations observed in the review can be
found at the methodological level. First of all, there are
very few studies using samples selected at random from
the population. Secondly, the majority of research
concentrates on the normal population, on university
students from introductory Psychology courses. Thirdly,
there is scarce use of other, more recent models or
statistical techniques, such as Item Response Theory (IRT).
And fifthly, and as pointed out above, the features of
schizotypal personality vary in accordance with certain
characteristics of participants, with few studies evaluating
systematically the differential functioning of the items
(Guilera, Gómez, & Hidalgo, 2006).
Schizotypy has generated its own research line as
regards its structure, nature and relationships with other
constructs. Studies on schizotypy can be categorized
according to three periods. The first of these saw the
creation of scales for evaluating features similar to those
of schizophrenia, such as the Wisconsin-Madison
University group scales, referred to earlier. Subsequently,
schizotypy measurement scales were designed from a
multidimensional and comprehensive perspective of
psychosis proneness, as is the case of the
Liverpool Inventory of Feeling and Experiences
(Mason, Claridge, & Jackson, 1995). In a third period,
the current one, researchers are carrying out factor
analyses of a confirmatory type, as well as factor analyses
employing in a combined fashion different self-reports for
assessing the schizotypy dimensions. Work is also being
done using factor analyses in conjunction with other
scales that measure constructs related to schizotypal
features, such as dissociative experiences (Pope &
Kwapil, 2000), obsessive-compulsive disorder (Suhr,
Spitznagel, & Gunstad, 2006), Asperger’s syndrome
(Hurst, Nelson-Gray, Mitchell, & Kwapil, 2006) or
anxious-depressive symptomatology (Lewandowski et al.,
Future research in the field of schizotypy should take into
account such methodological limitations. The relationship
between schizotypy and other psychopathological
constructs (such as obsessive-compulsive disorder) is
interesting with regard to both clinical practice and
comorbidity studies. The development of combined
factorial studies employing different types of schizotypy
assessment instruments also appears to make sense with a
view to unification of the construct. Globalization and
internationalization lead to an increase in the number of
test adaptations and translations from one culture to
another, and such adaptations and translations should be
carried out with rigour, following the guidelines of the
International Test Commission
(Muñiz & Hambleton,
1996). Studies comparing schizotypy across cultures are
of great relevance to improved understanding of the
cross-cultural, universal nature of schizotypy. Finally,
instruments for evaluating schizotypy should demonstrate
their predictive value, sensitivity and specificity in
independent studies with a view to early detection and
intervention in those who are prone to the development of
disorders on the schizophrenic spectrum.
This research was financed by the Spanish Ministry of
Education and Science (BES-2006-12797, SEJ 2005-
08924, SEJ-2005-08357), and by the Education Board
of the Principality of Asturias (IB-05-02, COF05-005).
Álvarez López, E., & Andrés Pueyo, A. (2006).
Instrumentos de evaluación clínica de la personalidad
Interpsiquis 2006
Axelrod, S. R., Grilo, M. C., Sanislow, C., & McGlashan,
T. H. (2001). Schizotypal Personality Questionnaire-
Brief: Factor structure and convergent validity in
inpatient adolescent.
Journal of Personality Disorders,
, 168-179.
Aycicegi, A., Dinn, W. M., & Harris, C. L. (2005).
Validation of Turkish and English versions of the
Regular articles
Schizotypal Personality Questionnaire-B.
Journal of Psychological Assessment, 21
, 34-43.
Badcock, J. C., & Dragovic, M. (2006). Schizotypal
personality in mature adults.
Personality and Individual
Differences, 40
, 77-85.
Barrantes-Vidal, N., Fañanás, L., Rosa, A., Caparrós, B.,
Riba, M. D., & Obiols, J. E. (2003). Neurocognitive,
behavioral and neurodevelopmental correlates of
schizotypy clusters in adolescents from the general
Schizophrenia Research, 61
, 293-302.
Calkins, M. E., Curtis, C. E., Grove, W. M., & Iacono, W.
G. (2004). Multiple dimensions of schizotypy in first
degree biological relatives of schizophrenia patients.
Schizophrenia Bulletin, 30
, 317-325.
Chapman, J. P., Chapman, L. J., & Raulin, M. L. (1976).
Scales for physical and social anhedonia.
Journal of
Abnormal Psychology, 87
, 374-382.
Chapman, J. P., Chapman, L. J., Raulin, M. L., & Eckblad,
M. (1994). Putatively Psychosis-prone Subjects 10
years later.
Journal of Abnormal Psychology, 87
, 399-
Chapman, L. J., Chapman, J. P., & Raulin, M. L. (1978).
Body-image aberration in schizophrenia.
Journal of
Abnormal Psychology, 87
, 399-407.
Chapman, L. J., Edell, E. W., & Chapman, J. P. (1980).
Physical anhedonia, perceptual aberration and
psychosis proneness.
Schizophrenia Bulletin, 6
, 639-
Chen, W. J., Hsiao, C. K., & Lin, C. C. H. (1997).
Schizotypy in community samples: The three-factor
structure and correlation with sustained attention.
Journal of Abnormal Psychology, 106
, 649-654.
Claridge, G. (1997).
Schizotypy: Implications for illness
and health
. Oxford: Oxford University Press.
Claridge, G., McCreery, C., Mason, O., Bentall, R.,
Boyle, G., Slade, P., & Popplewell, D. (1996). The
factor structure of 'schizotypal' traits: A large
replication study.
British Journal of Clinical Psychology,
, 103-115.
Compton, M. T., Chien, V. H., & Bollini, A. (2007).
Psychometric properties of the Brief version of the
Schizotypal Personality Questionnaire in relatives with
schizophrenia-spectrum disorders and non-psychotic
Schizophrenia Research, 91
, 122-131.
Cyhlarova, E., & Claridge, G. (2005). Development of a
version of the Schizotypy Traits Questionnaire (STA) for
screening children.
Schizophrenia Research, 80
, 253-
DiDuca, D., & Joseph, S. (1999). Assessing schizotypal
traits in 13-18 year olds: Revising the JSS.
and Individual Differences, 27
, 673-682.
Dinn, W. M., Harris, C. L., Aycicegi, A., Greene, P., &
Andover, M. S. (2002). Positive and negative
schizotypy in a student sample: Neurocognitive and
clinical correlates.
Schizophrenia Research, 56
, 171-
Eckblad, M., & Chapman, L. J. (1983). Magical ideation
as an indicator of schizotypy.
Journal of Consulting
and Clinical Psychology, 51
, 215-225.
Eckblad, M., Chapman, L. J., Chapman, J. P., &
Mishlove, M. (1982). The Revised Social Anhedonia
Scale. Unpublished manuscript, University of
Wisconsin - Madison.
Fonseca-Pedrero, E., Campillo-Álvarez, A., Muñiz, J.,
Lemos Giráldez, S., & García-Cueto, E. (2007).
Adaptación española del Thinking and Perceptual
Style Questionnaire. Libro de Actas del X Congreso de
Metodología de las Ciencias Sociales y del
Comportamiento. Barcelona.
Fossati, A., Raine, A., Carretta, I., Leonardi, B., & Maffei,
C. (2003). The three-factor model of schizotypal
personality: Invariance across age and gender.
Personality and Individual Differences, 35
, 1007-
Gooding, D. C., Kathleen, A. T., & Matts, C. W. (2005).
Clinical status of at-risk individuals 5 years later: Futher
validation of the psychometric high-risk strategy.
Journal of Abnormal Psychology, 114
, 170-175.
Graves, R. E., & Weinstein, S. (2004). A Rasch Analysis
of three of the Wisconsin Scales of Psychosis
Proneness: Measurement of schizotypy.
Journal of
Applied Measurement, 5
, 160-171.
Guilera, G., Gómez, J., e Hidalgo, M. D. (2006).
Funcionamiento diferencial de los ítems: Un análisis
bibliométrico de las revistas editadas en español.
Psicothema, 18
, 841-847.
Heron, J., Jones, I., Williams, J., Owen, M. J., Craddock,
N., & Jones, L. A. (2003). Self-reported schizotypy and
bipolar disorder: Demonstration of a lack of specificity
of the Kings Schizotypy Questionnaire.
Research, 65
, 153-158.
Hurst, R. M., Nelson-Gray, R. O., Mitchell, J. T., &
Kwapil, T. R. (2006). The relationship of Asperger's
characteristics and schizotypal personality traits ina
Non-clinical Adult Sample.
Journal of Autism and
Developmental Disorders, Dec 6
Regular articles
al Traits
; BAI:
John, J. P., Khanna, S., Thennarasu, K., & Reddy, S.
(2003). Exploration of dimensions of psychopathology
in neuroleptic-naive patients with recent-onset
schizophrenia/schizophreniform disorder.
Research, 121
, 11-20.
Johns, L. C., & van Os, J. (2001). The continuity psychotic
experiences in the general population
Psychology Review, 21
, 1125-1141.
Kwapil, T. R., Miller, M. B., Zinser, M. C., Chapman, J.
P., & Chapman, L. J. (1997). Magical ideation and
social anhedonia as predictors of psychosis proneness:
A partial replication study.
Journal of Abnormal
Psychology, 106
, 491-495.
Lemos Giráldez, S., Vallina, O., Fernández, P., Ortega,
J. A., García, P., Gutiérrez, A., García, A., Bobes, J.,
& Miller, T. J. (2006). Validez predictiva de la escala
de síntomas prodrómicos (SOPS).
Actas Españolas de
Psiquiatría, 34
, 216-233.
Lenzenweger, M. F. (1994). Psychometric high-risk
paradigm, perceptual aberrations, and schizotypy: An
Schizophrenia Bulletin, 20
, 121-135.
Lewandowski, K. E., Barrantes-Vidal, N., Nelson-Gray, R.
O., Clancy, C., Kepley, H. O., & Kwapil, T. R. (2006).
Anxiety and depression symptoms in psychometrically
identified schizotypy.
Schizophrenia Research, 83
Lindenmayer, J. P., Brown, E., Baker, R. W., Schuh, L. M.,
Shao, L., Tohen, M., Ahmed, S., & Stauffer, V. L.
(2004). An excitement subscale of the Positive and
Negative Syndrome Scale.
Schizophrenia Research,
, 331-337.
Linscott, R. J., & Knight, R. G. (2004). Potentiated
automatic memory in schizotypy.
Personality and
Individual Differences, 37
, 1503-1517.
Martinena Palacio, P., Blas Navarro, J., Medina, C.,
Baños Yeste, I., Sabañés, A., Vicens Vilanova, J., et al.
(2006). Esquizotipia & memoria verbal en la
población general adolescente.
Psicothema, 18
, 439-
Martínez-Suárez, P. C., Ferrando, P. J., Lemos, S., Inda
Caro, M., Paino-Piñeiro, M., & López-Rodrigo, A. M.
(1999). Naturaleza y estructura del constructo
Análisis y Modificación de Conducta, 25
Mason, O., & Claridge, G. (2006). The Oxford-Liverpool
Inventory of Feelings and Experiences (O-LIFE): Further
description and extended norms.
Research, 82
, 203-211.
Mason, O., Claridge, G., & Jackson, M. (1995). New
scales for the assessment of schizotypy.
Personality and
Individual Differences, 18
, 7-13.
Mass, R., Girndt, K., Matouschek, A.-K., Peter, P. M.,
Plitzko, N., Andresen, B., Haasen, C., & Dahme, B.
(2007). Introducing the Eppendorf Schizophrenia
Inventory (ESI) as a psychometric method for
schizotypy reseach.
Personality and Individual
Differences, 42
, 525-534.
Mata, I., Mataix-Cols, D., & Peralta, V. (2005).
Schizotypal Personality Questionnaire-Brief: Factor
structure and influence of sex and age in a nonclinical
Personality and Individual Differences, 38
McGlashan, T. H., & Johannessen, J. O. (1996). Early
detection and intervention whith schizophrenia:
Schizophrenia Bulletin, 22
, 201-222.
Meehl, P. E. (1962). Schizotaxia, schizotypy,
American Psychologist, 17
, 827-838.
Muntaner, C., García-Sevilla, L., Fernández, A., &
Torrubia, R. (1988). Personality dimensions,
schizotytpal and bordeline traits and psychosis
Personality and Individual Differences, 9
Muñiz, J., & Hambleton, R. K. (1996). Directrices para la
traducción y adaptación de los tests.
Papeles del
Psicólogo, 66
, 63-70.
Pope, C. A., & Kwapil, T. R. (2000). Dissociative
experiences in hypothetically psychosis-prone college
Journal of Nervous and Mental Disease, 188
Raine, A. (1991). The SPQ: A scale for the assessment of
schizotypal personality based on DSM-III-R criteria.
Schizophrenia Bulletin, 17
, 555-564.
Raine, A., & Benishay, D. (1995). The SPQ-B: A brief
screening instrument for schizotypal personality
Journal of Personality Disorders, 9
, 346-355.
Rawlings, D., Claridge, G., & Freeman, J. L. (2001).
Principal components analysis of the Schizotypal
Personality Scale (STA) and the Borderline Personality
Scale (STB).
Personality and Individual Differences, 31
Rawlings, D., & MacFarlane, C. (1994). A
multidimensional schizotypal traits questionnaire for
young adolescents.
Personality and Individual
Differences, 17
, 489-496.
Reynolds, C. A., Raine, A., Mellingen, K., Venables, P.
H., & Mednick, S. A. (2000). Three-factor model of
Regular articles
schizotypal personality: Invariance across culture,
gender, religious affiliation, family adversity, and
Schizophrenia Bulletin, 26
, 603-
Stefanis, N. C., Smyrnis, N., Avramopoulos, D.,
Evdokimidis, I., Ntzoufras, I., & Stefanis, C. N. (2004).
Factorial composition of self-rated schizotypal traits
among young males undergoing military training.
Schizophrenia Bulletin, 30
, 335-350.
Suhr, J. A., & Spitznagel, M. B. (2001). Factor versus
cluster models of schizotypal traits. I: A comparison of
unselected and highly schizotypal samples.
Schizophrenia Research, 52
, 231-239.
Suhr, J. A., Spitznagel, M. B., & Gunstad, J. (2006). An
Obsessive-Compulsive subtype of Schizotypy: Evidence
from a nonclinical sample.
The Journal of Nervous and
Mental Disease, 194
, 884-886.
Vallina, O., Lemos Giráldez, S., & Fernández, P. (2006).
Estado actual de la detección e intervención temprana
en psicosis.
Apuntes de Psicología, 24
, 185-221.
van Kampen, D. (2006). The Schizotypic Syndrome
Questionnaire (SSQ): Psychometrics, validation and
Schizophrenia Research, 84
, 305-322.
Venables, P. H., & Bailes, K. (1994). The structure of
schizotypy, its relation to subdiagnoses of
schizophrenia and to sex and age.
British Journal of
Clinical Psychology, 33
, 277-294.
Venables, P. H., & Rector, N. A. (2000). The content and
structure of schizotypy: A study using confirmatory
factor analysis.
Schizophrenia Bulletin, 26
, 587-602.
Verdoux, H., & Van Os, J. (2002). Psychotic symptoms in
non-clinical populations and the continuum of
Schizophrenia Research, 54
, 59-65.
Vollema, M. G., & Hoijtink, H. (2000). The
multidimensionality of self-report schizotypy in a
psychiatric population: An analysis using
multidimensional Rasch models.
Bulletin, 26
, 565-575.
Vollema, M. G., Sitskoorn, M. M., Appels, M. C. M., &
Kahn, R. S. (2002). Does the Schizotypal Personality
Questionnaire reflect the biological-genetic
vulnerability to schizophrenia?
Research, 54
, 39-45.
Wolfradt, U., & Straube, E. R. (1998). Factor structure of
schizotypal traits among adolescents.
Personality and
Individual Differences, 24
, 201-206.
Wuthrich, V., & Bates, T. C. (2006). Confirmatory factor
analysis of the three-factor structure of the schizotypal
personality questionnaire and Chapman schizotypy
Journal of Personality Assessment, 87
, 292-
Yela, M. (1997).
La técnica del análisis factorial. Un
método de investigación en psicología y pedagogía
Madrid: Biblioteca Nueva.
Regular articles
... Schizotypy is overrepresented among relatives of schizophrenics (Horrobin 1998) and is related to the prodromal period of schizophrenia (Olsen and Rosenbaum 2006). The main characteristics of schizotypy can be classified into three or four dimensions (Claridge et al. 1996;Fonseca-Pedrero et al. 2007;Mason et al. 2005): ...
... While previous studies conceptualized and measured schizotypy multidimensionally (Fonseca-Pedrero et al. 2007), the multidimensionality of religiosity was usually neglected, which was criticized by a range of researchers as a limitation of past research (Breslin and Lewis 2015;Day and Peters 1999;Joseph et al. 2002;Ng 2007;Peters et al. 1999;Unterrainer et al. 2011;White et al. 1995). To the best of our knowledge, multidimensional approaches of religiosity in these studies are restricted to prayers (Breslin and Lewis 2015), religious/spiritual well-being (Unterrainer et al. 2011), and intrinsic/extrinsic religious orientation (e.g., Reed and Clarke 2014). ...
Full-text available
Previous research has established a reliable link between religiosity and schizotypy as well as schizophrenia. However, past research mainly measured religiosity as a one-dimensional construct. In the present research (N = 189), we aimed to get a better understanding of the religiosity-schizotypy link by measuring religiosity using Huber's five-dimensional model of Centrality of Religiosity, while also testing for curvilinear relations and potential moderators. We found negative small-to-medium-sized correlations between all five dimensions of religiosity and the schizotypy dimension of impulsive nonconformity, but no reliable associations with the other three dimensions of schizotypy: unusual experiences, cognitive disorganization, and introverted anhedonia. Some of these associations were moderated by religious affiliation: Religiosity and schizotypy correlated positively among non-members, but negatively among members of religious communities, suggesting that affiliation has a positive impact on the well-being of religious people. In line with Huber's predictions, we found a reversed U-shape association between the religious dimension of private religious practice and schizotypy. Unexpectedly, however, conformity and tradition values did not moderate the relations between religiosity and schizotypy. We discuss our findings in terms of person-environment fit, the prevention hypothesis of the schizotypy-religiosity link, and offer implications for mental health practitioners.
... The results showed that the hybrid seven-factor model fitted the data adequately across gender: χ 2 =342. 67 SRMR=0.0520), suggesting that configural invariance was achieved across both groups. ...
Background: The Schizotypal Personality Questionnaire (SPQ) is a widely used scale for measuring schizotypal characteristics modeled on DSM-III-R criteria for schizotypal personality disorder (SPD). The aim of this study was to examine the factorial structure of the Greek SPQ, its factorial invariance across gender and different age groups and possible gender and age group differences at latent mean level. Methods: Eight hundred sixty-five community participants completed the Greek version of the SPQ. Results: With regard to the factorial structure of the original first-order model, the results showed that a seven-factor model (sub-scales "no close friends" with "constricted affect" and "ideas of reference" with "unusual perceptual experiences" were combined) was replicated adequately. Furthermore, the second-order "paranoid" model provided also adequate fit. With regard to the factorial invariance of the SPQ across gender and age, the analysis revealed that both, the first- and second-order models showed measurement invariance (configural, metric and structural) across gender and age groups (17-35 vs. 36-70). Latent mean differences across gender and age groups were also found. Conclusions: Based on these findings, we can conclude that the Greek version of the SPQ is a psychometrically sound instrument for measuring schizotypal characteristics and a useful screening tool for SPD across gender and age.
... Hasta hoy, no existe un tratamiento preventivo eficaz para las psicosis, dirigido a la población general (prevención primaria universal). La investigación sobre los perfiles de riesgo de psicosis, particularmente los rasgos de la personalidad esquizotípica, constituye un fructífero y prometedor ámbito de investigación (Fonseca, Muñiz, Lemos, Paino y Villazón, 2010;Fonseca Pedrero et al., 2007;Raine, 1991Raine, , 2006, pero todavía no es posible predecir con seguridad qué individuos transitarán a la psicosis (prevención primaria selectiva). En particular, se constata una limitada capacidad para identificar los niveles de experiencias psicotiformes y para predecir qué personas con síntomas positivos atenuados desarrollarán una psicosis franca, por cuanto dichas experiencias no constituyen un fenómeno unitario; existiendo varios tipos, probablemente con diferentes trayectorias y causas subyacentes. ...
Full-text available
El objetivo de este artículo es resumir los conocimientos actuales sobre los tratamientos farmacológicos, psicosociales y otros procedimientos terapéuticos que se aplican a las psicosis. Si bien la medicación antipsicótica viene siendo el tratamiento de elección para las psicosis, y en especial para la esquizofrenia, la mejoría obtenida en los síntomas positivos es sólo moderada, y no ha demostrado eficacia en la mejora de los síntomas deficitarios persistentes. Incluso muchos pacientes continúan sufriendo los síntomas positivos y recaídas, especialmente cuando falla el cumplimiento del tratamiento farmacológico. Todo ello, pone en evidencia la necesidad de utilizar otros tratamientos adjuntivos, que ayuden al paciente a comprender y a manejar sus trastornos, a aliviar los síntomas, a mejorar el cumplimiento terapéutico, su funcionamiento social y su calidad de vida, y a resolver los problemas que no logran solución con la medicación. En la actualidad, el tratamiento de las psicosis requiere un enfoque amplio, multimodal, que incluya medicación, psicoterapia y tratamientos psicosociales (psicoeducación e intervenciones dirigidas a la solución de problemas, terapia cognitivo-conductual, rehabilitación cognitiva, entrenamiento en habilidades sociales y terapia asertiva comunitaria), así como ayuda en la búsqueda de alojamiento y recursos económicos que le permitan sobrevivir. En el futuro próximo, deberán desarrollarse intervenciones más adaptadas a las diferentes fases que presentan las psicosis.
... As yet there is no effective preventive treatment for psychoses aimed at the general population (universal primary prevention). Research on risk profiles for psychosis, and particularly schizotypal personality traits, is a fruitful and promising field (Fonseca, Muñiz, Lemos, Paino, & Villazón, 2010; Fonseca Pedrero et al., 2007; Raine, 1991 Raine, , 2006), but it is still not possible to predict with confidence which individuals will make the transition to psychosis (selective primary prevention). In particular, there is a limited capacity to identify levels of psychotic-like experiences and to predict which persons with attenuated positive symptoms will develop a fullblown psychosis, since such experiences do not constitute a unitary phenomenon: there are various types, probably with different courses and underlying causes. ...
Full-text available
The purpose of this paper is to summarize our current knowledge about pharmacological, psychosocial, and other emerging treatments for psychoses. Although antipsychotic medications are the mainstay of treatment for psychoses, and particularly for schizophrenia, the degree of improvement in positive symptoms is moderate, and has no demonstrable efficacy against positive enduring or deficit negative symptoms. Indeed, many patients continue to suffer from persistent positive symptoms and relapses, particularly when they fail to adhere to prescribed medications. This underlines the need for additional treatment methods to help patients understand and manage their disorders, alleviate symptoms, improve adherence, social functioning and quality of life, and solve problems that do not fully respond to medication. Nowadays, comprehensive treatment entails a multi-modal approach, including medication, psychotherapy and social treatments (psychoeducation and coping-oriented interventions, cognitive behaviour therapy, cognitive remediation, social skills training and assertive community treatment), as well as assistance with housing and financial sustenance. In the foreseeable future, phase-specific interventions ought to be applied to different stages of psychoses.
... The positive dimension (unusual experiences) and negative dimension (anhedony) consistently appear in most papers. The third dimension is related to a disorganisation factor or paranoia (Fonseca-Pedrero et al., 2007). According to literature, high score in schizotypy selfreports is a high-risk factor for the eventual development of schizophrenia spectrum disorders (Chapman, Chapman, Raulin, & Eckblad, 1994;Kwapil, 1998;Kwapil, Miller, Zinser, Chapman, & Chapman, 1997). ...
Full-text available
Introduction: Schizotypy is a psychological construct related to schizophrenia. The exact relationship between both entities is not clear. In recent years, schizophrenia has been associated with hippocampal abnormalities and spatial memory problems. The aim of this study was to determine possible links between high schizotypy (HS) and low schizotypy (LS) and spatial abilities, using virtual reality tasks. We hypothesised that the HS group would exhibit a lower performance in spatial memory tasks than the LS group. Methods: Two groups of female students were formed according to their score on the ESQUIZO-Q-A questionnaire. HS and LS subjects were tested on two different tasks: the Boxes Room task, a spatial memory task sensitive to hippocampal alterations and a spatial recognition task. Results: Data showed that both groups mastered both tasks. Groups differed in personality features but not in spatial performance. These results provide valuable information about the schizotypy-schizophrenia connections. Conclusion: Schizotypal subjects are not impaired on spatial cognition and, accordingly, the schizotypy-schizophrenia relationship is not straightforward.
Full-text available
Objectives: This study was carried out to evaluate the psychometric properties of the Farsi version of Schizotypal Personality Questionnaire (SPQ) in a student sample. Method: 727 university students (442 males, 285 females) with a mean age of 23, who were selected using stepwise stratified method, and 15 patients with schizophrenia who were selected using convenience sampling, completed SPQ. The SPQ is a 74 items self-report questionnaire, which assesses nine DSM-III-R criteria for Schizotypal Personality Disorder. Data were analyzed by SPSS-16 and using Pearson’s correlation coefficient, independent t-test, multivariate analysis of variance, and exploratory factor analysis. Results: Cronbach’s alpha for the total questionnaire and its subscales were 0.90 and 0.59-0.82 respectively. SPQ accurately differentiated patients with schizophrenia from normal population. The exploratory factor analysis for SPQ confirmed the accuracy of threefactor structure introduced by Raine (cognitive-perceptual, interpersonal, and disorganized). Conclusion: SPQ is a valid and reliable instrument for assessing symptoms, dimensions, and factors of Schizotypal Personality Disorder.
Full-text available
The goal of this paper is comparison of positive and negative symptoms of schizotypy and schizotypal character aspects among boy and girl stu-dents. For this purpose, 150 female and 150 male students in University of Tabriz were selected using random cluster sampling. Schizotypal character questionnaire (Raine, 1991) was conducted. Descriptive statis-tic indexes and multivariate analysis of variance (MANOVA) was used for data analysis. Findings indicated that there is significant difference in schizotypal character general index between boys and girls (P< 0.05). In addition, meaningful difference was observed between boys and girls in subjects such as schizotypal negative symptoms and dimensions of unu-sual conceptual experiences, limited emotion, lack of close friends, and strange speech (P< 0.05). In contrast, there was no considerable differ-ence between them in schizotypal positive symptoms and magical thought dimensions, turning thought, suspicion or mistrust, extreme so-cial anxiety, and strange behavior (P>0.05). Totally, the results showed that male students experience more and intense non-clinical symptoms in schizotypal character general index and schizotypy negative symptoms in comparison to female ones, representing having the readiness for catch-ing psychosis disorders.
Full-text available
Objectives: This study carried out in order to evaluate the psychometric of the Persian version of the Schizotypal Personality Questionnaire (SPQ;Rain,1991) in Iranian student sample. The SPQ is a 74-self-report questionnaire to assess the dimension and factors of Schizotypal Personality Disorder (SPD). Method: In this descriptive, analytic, and corelational study, SPQ was assessed on 727 students of Tabriz University (442 males,285 females) and 15 schizophrenic inpatients of Tabriz Razi Hospital. Data were analyzed using correlation, tow independent samples t-test, and Exploratory Factor Analysis (EFA). Results: Consistency coefficient for the SPQ was 0.90, and the range of reliability coefficients for the dimensions of SPQ were from 0.59 to 0.82. SPQ accurately differentiated schizophrenic patients from normal people. The Exploratory Factor Analysis for SPQ confirmed the accuracy of three-factor structure introduced by Raine (1991). Conclusions: Based on these results, the SPQ is a valid and reliable instrument for assessing symptoms, dimensions, and factors of Schizotypal Personality Disorder(SPD). Keywords: Schizotypal Personality Questionnaire, Schizotypal Personality Disorder, reliability, validity, Exploratory Factor Analysis (EFA).
Introduction Although Positive (PS) and Negative Schizotypy (NS) are considered distinct entities, prefrontal dysfunction seems to be a common underlying mechanism. According to recent evidence, PS can be divided into Paranoid (ParS) and Cognitive-Perceptual (CPS). Objectives To explore NS', ParS' and CPS' profiles of prefrontal function/psychopathology/stressful childhood experiences. Aims To examine associations between NS, ParS and CPS with the above phenotype in a community sample. Methods 140 healthy adults completed the Schizotypal-Personality Questionnaire (SPQ), Symptom-Checklist-90-Revised (SCL-90R), Wisconsin Card-Sorting Test (WCST), CANTAB Spatial Working Memory (SWM), Parental-Bonding Instrument (PBI) and Child Abuse/Trauma Scale (CAT). Associations between schizotypal dimensions and outcome variables were examined with separate forward regression-analyses (confounders: age, smoking). Results High ParS and NS but not CPS were predicted by high CAT score and low parental-care respectively (Ps 2 :0.155 and 0.243) while high ParS also predicted fewer WCST-completed categories and increased total errors (Ps 2 :0.138 and 0.174). All schizotypal dimensions along with reduced parental-care predicted high SCL-90 psychopathology in all dimensions (Ps 2 range:0.211-0.426), ParS predicted mostly obsessive-compulsive symptomatology, anxiety, paranoid ideation and psychoticism (R 2 range:0.257-0.373) and CPS predicted mostly somatization and anger/hostility (R 2 :0.240 and 0.213). Conclusions ParS and NS were similar in terms of prefrontal dysfunction and childhood life experiences although they differed in their clinical psychopathology patterns. CPS seems to be a 'less severe" form of schizotypy in terms of prefrontal dysfunction and childhood experiences with minimal impact on current psychopathology.
Full-text available
The heterogeneity of schizotypal traits, suggested in previous research, was further investigated in a sample of subjects (N = 1095) administered a composite questionnaire consisting of a large number of published scales the majority of which were designed to measure psychotic characteristics. Factor analysis confirmed the four components previously indicated in our work with the same instrument; namely, 'aberrant perceptions and beliefs', 'cognitive disorganization', 'introvertive anhedonia ' and ' asocial behaviour '. This structure was maintained regardless of whether or not the analysis included scales from the Eysenck Personality Questionnaire, which might otherwise have been held to explain the variance. ' Aberrant perceptions and beliefs '-reminiscent of the positive symptoms of schizophrenia-was the strongest component; but given the multidimensional nature of the data, together with the pattern of factor loadings and intercorrelations for the sees involved, it was concluded that the broader term 'psychosis proneness' or 'psychoticism' (in a non-Eysenckian sense) might be a better descriptor of the clinical and personality domain sampled.
Full-text available
Introduction. We conduct an exploratory factor analysis with the Scale of Prodromal Symptoms (SOPS) items, to determine its psychometric characteristics and construct validity, as well as we analyze criterion or pre-dictive validity of its clinical subscales in the conversion of high mental risk subjects from prodrome to psychosis in a 1 year follow-up period. Method. The subjects were 30 patients referred for evaluation with the Structured Interview of Prodromal Syndromes (SIPS), which includes the SOPS, because of a suspected psychosis prodromal syndrome, a factor analysis with varimax rotation was carried out: Cron-bach internal coherence indices were obtained, and pre-dictive validity of the subscales comprising this instrument were analyzed using logistic regression. Results. Three first-order factors were found, one of them was a homogeneous component made up of negative symptoms, consistent with previous studies, and higher scores were observed in negative, disorganized and general symptoms in males. Cronbach's alpha indices were 0.880, in the recruitment phase of risk patients, and 0.952 one year later. With an incidence rate of psychosis of 26.67 % in the sample studied, during the 1 year follow-up period, an excellent positive predictive value of the SOPS subscales was found, with negative symptoms having the best specificity (95.5 %) and sensitivity (100 %) indices. Conclusions. Diagnostic criteria based on the SIPS/ SOPS make it possible to identify persons at high risk of psychosis, and to make an accurate prediction of medium term psychotic episodes. It is a valid, economical and easy to use instrument in primary health care systems.
Currently there are no brief screening instruments for Diagnostic and Statistical Manual of Mental Disorders (DSM) defined schizotypal personality disorder (SPD). This study reports the development of a brief, 2-minute, 22-item self-report screening instrument, the Schizotypal Personality Questionnaire-Brief (SPQ-B), for SPD. Four independent subject samples provided the basis for test development. The SPQ-B contains a total scale score and three subscales to assess the three main factors of SPD, viz. Cognitive-perceptual Deficits, Interpersonal Deficits, and Disorganization. Reliability for the scales averaged 0.76, and scale scores correlated significantly with independent clinical ratings of DSM-III-R schizotypal traits (average r = 0.62), indicating criterion validity for the scales. The SPQ-B is recommended for use in large-scale screening for SPD prior to a confirmatory clinical interview and also for dimensional research on the correlates of schizotypal features in the normal population.
The Schizotypal Personality scale (STA) is a popular measure of schizotypal personality. The Borderline Personality scale (STB) is a rarely used measure of borderline personality. Together they comprise the Schizotypal Traits Questionnaire, as described by Claridge and Broks [Claridge, G., & Broks, P. (1984). Schizotypy and hemisphere function: I. Theoretical considerations and the measurement of schizotypy. Personality and Individual Differences, 5, 633–648]. The present article reports Principal Components Analyses, followed by Promax rotation, of the tetrachoric correlation matrix of the items of each of the two scales. The STA analysis suggested four factors labelled Magical Thinking, Unusual Perceptual Experiences, Paranoid Suspiciousness and Isolation, and Social Anxiety. This factor structure is compared with previous factor analytic studies of the same scale. Factor analysis of the STB has not been previously reported. Two factors were produced and formed the basis for two correlated sub-scales labelled Hopelessness and Impulsiveness. Separate analyses for females and males provided substantial support for the full-sample analyses. Alpha-coefficients, sex differences and correlations with age are provided for the various scales and sub-scales.
The Schizotypal Traits Questionnaire for young Adolescents (JSS) was designed by Rawlings and McFarlane, 1994to measure schizotypal traits in adolescents. The original questionnaire contained 74 items, consisting of 7 subscales; physical anhedonia, social anhedonia, paranoid ideation, magical ideation, cognitive disorganisation, perceptual aberration and impulsive nonconformity. The aim of this study was to further investigate the structure of the JSS. Principal components analysis of the 74 items with 492 respondents (ranging in age from 13 to 18) revealed a strong 5 factor structure, consisting of the cognitive, perceptual and social aspects of schizotypy, plus physical anhedonia and impulsive nonconformity. A reliability analysis reduced the number of items to 50. The revised 50-item version of the JSS has a more replicable factor structure, with 5 subscales clearly identified through statistical analysis.
The present study was aimed at assessing the relationship between personality dimensions and psychopathological traits of psychosis proneness. Consistent with this goal, a psychometric study was carried out involving a sample drawn from a population of first year university students (n = 735). Subjects completed Eysenck and Eysenck's scales measuring the three major descriptive dimensions of his personality model (Psychoticism, Extraversion and Neuropticism), Claridge and Broks's scales of schizotypal and borderline traits and Chapman and Chapman's scales of Physical Anhedonia, Social Anhedonia, Perceptual Aberration and Magical Ideation traits. Results suggest that different sets of psychopathological traits can be identified in psychosis proneness which relate to the three personality dimensions. These findings seem in accordance with high-risk and clinical research studies. Implications for future research on psychosis proneness including personality variables are discussed.
"I hypothesize that the statistical relation between schizotaxia, schizotypy, and schizophrenia is class inclusion: All schizotaxics become on all actually existing social learning regimes, schizotypic in personality organization; but most of these remain compensated. A minority, disadvantaged by other… constitutional weaknesses, and put on a bad regime by schizophrenogenic mothers… are thereby potentiated into clinical schizophrenia. What makes schizotaxia etiologically specific is its role as a necessary condition… . It is my strong personal conviction that… schizophrenia, while its content is learned, is fundamentally a neurological disease of genetic origin." (PsycINFO Database Record (c) 2012 APA, all rights reserved)
We present normative data for a Turkish translation of the Schizotypal Personality Questionnaire-B (SPQ-B). The SPQ-B is a brief, self-report screening instrument developed by Raine and Benishay (1995) and is used to evaluate respondents for the presence of schizotypal personality features. We describe the internal consistency and test-retest reliability of the Turkish instrument and report intercorrelations among subfactors and total SPQ-B score. For comparison purposes, we present normative data for the SPQ-B (English version) from two studies examining schizotypy among nonclinical student samples in the United States. We report α coefficients and assess the convergent validity of the SPQ-B by examining the relationship between scores on the SPQ-B and performance on two existing measures of schizotypy and schizophrenic-spectrum personality disorders. Central tendency, distribution of scores, factor structure, and intercorrelations in both Turkish and US samples were similar, suggesting that our Turkish translation of the SPQ-B is a culturally valid instrument. (PsycINFO Database Record (c) 2012 APA, all rights reserved)
The goal of the present study was to examine the influence of age and gender on the factor structure of the Schizotypal Personality Questionnaire (Raine, 1991). Schizotypal traits were assessed in a random sample of mature, adult community volunteers (average age 40 years). Four competing models of the latent factor structure were tested in the full sample (N = 352). The resulting three-factor model was then assessed separately in males and females and in stratified subsamples, reflecting three age cohorts. The results showed that, in mature adults, males had higher scores than females on No Close Friends and Constricted Affect whilst females had higher scores on Social Anxiety and Odd Beliefs subscales. Older adults were also characterized by lower total SPQ scores than those reported previously for younger adults. Despite the presence of age and sex-related differences in mean SPQ scores, a three-factor model of schizotypal personality best characterized the SPQ responses from mature adults, replicating that reported previously in high-school and university-aged samples. The implications of these findings of SPQ factor structure invariance, across age and gender, are discussed with reference to studies investigating neurocognitive correlates of schizotypy (i.e. endophenotypes).